RHIC束流能量扫描实验中正反粒子椭圆流的平均场势效应(英文)  

Mean-field Effects on Particle and Antiparticle Elliptic Flows in the Beam-energy Scan Program at RHIC

作　　者：徐骏[1] 柯治明 李锋 SONG Taesoo 刘鹤[1,4] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]CYCLOTRON INSTITUTE AND DEPARTMENT OF PHYSICS AND ASTRONOMY,TEXAS A&M UNIVERSITY,COLLEGE STATION [3]FRANKFURT INSTITUT FOR ADVANCED STUDIES THEORETICAL PHYSICS,JOHANN WOLFGANG GOETHE UNIVERSITAT [4]中国科学院大学,北京100049

出　　处：《原子核物理评论》2015年第2期146-153,共8页Nuclear Physics Review

基　　金：National Basic Research Program of China(973 Program)(2015CB856904,2014CB845401);”Shanghai Pujiang Program”(13PJ1410600);National Natural Science Foundation of China(11475243,11421505);Hundred Talents Program of Chinese Academy of Sciences(Y290061011,Y526011011);US National Science Foundation(PHY-1068572);Welch Foundation of US(A-1358)~~

摘　　要：最近,STAR合作体在相对论重离子对撞机的束流能量扫描实验中观测到了正反粒子的椭圆流劈裂。基于输运模型,发现丰重子介质中正反粒子平均场势的不同可以解释其椭圆流的劈裂。利用Nambu-Jona-Lasinio模型描述相对论重离子碰撞的部分子相,发现实验中正反粒子的相对椭圆流劈裂可以用来约束该模型中夸克矢量相互作用的耦合系数。这一发现对确定QCD相图的临界点位置和理解整个QCD的相结构有重要意义。The elliptic flow splitting between particles and their antiparticles has recently been observed by the STAR Collaboration in the beam-energy scan program at the Relativistic Heavy Ion Collider. In studies based on transport models, we have found that this splitting can be explained by the different mean-field potentials acting on particles and their antiparticles in the produced baryon-rich matter. In particular, we have shown that the experimentally measured relative elliptic flow difference can help constrain the vector coupling constant in the Nambu-Jona-Lasinio model used in describing the partonic stage of heavy-ion collisions. This information is useful for locating the critical point in the QCD phase diagram and thus understanding the phase structure of QCD.

关 键 词：束流能量扫描 QCD相图 椭圆流 

分 类 号：O571.6[理学—粒子物理与原子核物理]